[PATCH for-next] io_uring: mark task TASK_RUNNING before handling resume/task work

[PATCH for-next] io_uring: mark task TASK_RUNNING before handling resume/task work

[Jens Axboe]

Just like for task_work, set the task mode to TASK_RUNNING before doing
any potential resume work. We're not holding any locks at this point,
but we may have already set the task state to TASK_INTERRUPTIBLE in
preparation for going to sleep waiting for events. Ensure that we set it
back to TASK_RUNNING if we have work to process, to avoid warnings on
calling blocking operations with !TASK_RUNNING.

Fixes: b5d3ae202fbf ("io_uring: handle TIF_NOTIFY_RESUME when checking for task_work")
Reported-by: kernel test robot <oliver.sang@intel.com>
Link: https://lore.kernel.org/oe-lkp/202302062208.24d3e563-oliver.sang@intel.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

---

diff --git a/io_uring/io_uring.h b/io_uring/io_uring.h
index f90816aac896..2711865f1e19 100644
--- a/io_uring/io_uring.h
+++ b/io_uring/io_uring.h
@@ -281,8 +281,10 @@ static inline int io_run_task_work(void)
 	 * notify work that needs processing.
 	 */
 	if (current->flags & PF_IO_WORKER &&
-	    test_thread_flag(TIF_NOTIFY_RESUME))
+	    test_thread_flag(TIF_NOTIFY_RESUME)) {
+		__set_current_state(TASK_RUNNING);
 		resume_user_mode_work(NULL);
+	}
 	if (task_work_pending(current)) {
 		__set_current_state(TASK_RUNNING);
 		task_work_run();

-- 
Jens Axboe